package steps

import (
	"miasma-installer/tui/styles"
	"strings"

	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
)

type UserModel struct {
	Username      string
	Password      string
	usernameInput textinput.Model
	passwordInput textinput.Model
	confirmInput  textinput.Model
	focusIndex    int
	Finished      bool
}

func NewUserModel() UserModel {
	ui := textinput.New()
	ui.Placeholder = "username"
	ui.Focus()
	ui.CharLimit = 32
	ui.Width = 40

	pi := textinput.New()
	pi.Placeholder = "password"
	pi.EchoMode = textinput.EchoPassword
	pi.Width = 40

	ci := textinput.New()
	ci.Placeholder = "confirm password"
	ci.EchoMode = textinput.EchoPassword
	ci.Width = 40

	return UserModel{
		usernameInput: ui,
		passwordInput: pi,
		confirmInput:  ci,
	}
}

func (m UserModel) Init() tea.Cmd {
	return textinput.Blink
}

func (m UserModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	if m.Finished {
		return m, nil
	}

	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "enter":
			if m.focusIndex == 0 && m.usernameInput.Value() != "" {
				m.focusIndex = 1
				m.usernameInput.Blur()
				return m, m.passwordInput.Focus()
			} else if m.focusIndex == 1 && m.passwordInput.Value() != "" {
				m.focusIndex = 2
				m.passwordInput.Blur()
				return m, m.confirmInput.Focus()
			} else if m.focusIndex == 2 {
				if m.passwordInput.Value() == m.confirmInput.Value() && m.passwordInput.Value() != "" {
					m.Username = m.usernameInput.Value()
					m.Password = m.passwordInput.Value()
					m.Finished = true
					return m, nil
				}
			}

		case "tab", "shift+tab":
			m.focusIndex = (m.focusIndex + 1) % 3
			cmds := make([]tea.Cmd, 3)

			if m.focusIndex == 0 {
				cmds[0] = m.usernameInput.Focus()
				m.passwordInput.Blur()
				m.confirmInput.Blur()
			} else if m.focusIndex == 1 {
				cmds[1] = m.passwordInput.Focus()
				m.usernameInput.Blur()
				m.confirmInput.Blur()
			} else {
				cmds[2] = m.confirmInput.Focus()
				m.usernameInput.Blur()
				m.passwordInput.Blur()
			}

			return m, tea.Batch(cmds...)
		}
	}

	var cmd tea.Cmd
	if m.focusIndex == 0 {
		m.usernameInput, cmd = m.usernameInput.Update(msg)
	} else if m.focusIndex == 1 {
		m.passwordInput, cmd = m.passwordInput.Update(msg)
	} else {
		m.confirmInput, cmd = m.confirmInput.Update(msg)
	}

	return m, cmd
}

func (m UserModel) View() string {
	var content strings.Builder

	content.WriteString(styles.TitleStyle.Render("👤 User Account"))
	content.WriteString("\n\n")

	info := "Create your user account.\nThis user will have sudo privileges."
	content.WriteString(styles.InfoBoxStyle.Render(info))
	content.WriteString("\n\n")

	content.WriteString(styles.LabelStyle.Render("Username:"))
	content.WriteString("\n")
	usernameStyle := styles.InputStyle
	if m.focusIndex == 0 {
		usernameStyle = styles.FocusedInputStyle
	}
	content.WriteString(usernameStyle.Render(m.usernameInput.View()))
	content.WriteString("\n\n")

	content.WriteString(styles.LabelStyle.Render("Password:"))
	content.WriteString("\n")
	passwordStyle := styles.InputStyle
	if m.focusIndex == 1 {
		passwordStyle = styles.FocusedInputStyle
	}
	content.WriteString(passwordStyle.Render(m.passwordInput.View()))
	content.WriteString("\n\n")

	content.WriteString(styles.LabelStyle.Render("Confirm Password:"))
	content.WriteString("\n")
	confirmStyle := styles.InputStyle
	if m.focusIndex == 2 {
		confirmStyle = styles.FocusedInputStyle
	}
	content.WriteString(confirmStyle.Render(m.confirmInput.View()))
	content.WriteString("\n\n")

	if m.passwordInput.Value() != "" && m.confirmInput.Value() != "" {
		if m.passwordInput.Value() != m.confirmInput.Value() {
			content.WriteString(styles.ErrorStyle.Render("✗ Passwords do not match"))
			content.WriteString("\n\n")
		} else {
			content.WriteString(styles.SuccessStyle.Render("✓ Passwords match"))
			content.WriteString("\n\n")
		}
	}

	content.WriteString(styles.RenderHelp("Tab", "Switch fields", "Enter", "Continue"))

	return styles.AppStyle.Render(content.String())
}